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dependency-order

Generate a dependency graph of packages in a monorepo

Contents

• Introduction
• Install
• Example
• Usage
• API

Introduction

Generates a dependency list of packages in a monorepo.

Explicitly lists all monorepo (dev)dependencies in order, chunking into "stages" of similar dependency depth. Order of results in deterministic by stage and alphabetical order.

Can be called from any location inside a monorepo.

Install

npm i dependency-order

Example

Given file structure

/
└─┬ packages
  ├─┬ my-package-a
  │ └── package.json // { dependencies: { my-package-b: 'file:../my-package-b' } }
  ├─┬ my-package-b
  │ └── package.json // { devDependencies: { my-package-c: 'file:../my-package-b' } }
  └─┬ my-package-c
    └── package.json // { dependencies: { external-package: '1.2.3' } }

import { dependencyOrder } from 'dependencyOrder';

const order = await dependencyOrder();

console.log(order);
// [
//     {
//         "packageName": "my-package-c",
//         "stage": 0,
//         "dependencies": [],
//         "devDependencies": []
//     },
//     {
//         "packageName": "my-package-b",
//         "stage": 1,
//         "dependencies": [],
//         "devDependencies": ["my-package-c"]
//     },
//     {
//         "packageName": "my-package-a",
//         "stage": 2,
//         "dependencies": ["my-package-b"],
//         "devDependencies": []
//     },
// ]

Usage

dependency-order is an ESM module. That means it must be imported. To load from a CJS module, use dynamic import const { dependencyOrder } = await import('dependency-order');.

Currently, this library assumes all packages are referenced by their package name.

For example, a package.json of:

{
    "name": "abc",
    "dependencies": {
        "foo": "file:../bar",
    }
}

would fail because the package at bar is assumed to be named as such.

This library is also not capable of handling circular dependencies and will throw.

API

dependencyOrder(options?)

Returns a promise that resolves to a list of packages in the monorepo, in dependency order.

[
    {
        "packageName": "string",
        "stage": 2,
        "dependencies": ["<package-a>"],
        "devDependencies": ["<package-b>"],
        "packageMeta": {
            "directory": "/path/to/package",
            "name": "string",
            "packageJson": { "name": "string", "version": "1.2.3" }
        }
    }
]

Each package explicitly declares each package it is internally dependent on, defined via package.json's dependencies, devDependencies, and optionalDependencies (interpreted as dependencies). These values are computed deeply, so A depends on B depends on C -> A depends on B + C.

A dependent packages devDependencies will not impact `dependencies, but not vice versa. e.g. A depends on B dev-depends on C -> A depends on B. A dev-depends on B depends on C -> A dev-depends on B + C.

Note peerDependencies is omitted from this list, as it is assumed that any usage is "inherited" by a parent package. It is recommended peerDependent packages are also used in devDependencies if it should explicitly impact dependency order.

Outputted devDependencies and dependencies will have no overlap.

For simplicity, dependency order is defined as a stage (0-based). A packages stage is equal to MAX(allDependencies.stage) + 1.

The results are in order of increasing stage, with parallel packages in alphabetical order.

options

See packages-list options.

calculateDependencyOrder(packages)

Internally used by dependencyOrder, returns same response given a list of packages.

Used to calculate dependencies when the original list of packages has been edited/filtered.

e.g.

import { calculateDependencyOrder, dependencyOrder } from 'dependency-order';

const originalDependencies = await dependencyOrder();

const onlyPublicPackages = originalDependencies.map(
    dep => dep.packageMeta
).filter(
    packageMeta => !packageMeta.private
);

const onlyPublicDependencies = calculateDependencyOrder(onlyPublicPackages);

dependencyOrderByPackage(dependencies)

Convenience method for mapping dependencies by package name. Parameter is response from dependencyOrder.

{
    "package-a>": {
        "packageName": "<package-a>",
        "stage": 2,
        "dependencies": ["<package-b>"],
        "devDependencies": ["<package-c>"],
        "packageMeta": {
            "directory": "/path/to/package-a",
            "name": "string",
            "packageJson": { "name": "string", "version": "1.2.3" }
        }
    }
}

dependencyOrderByStage(dependencies)

Convenience method for grouping dependencies by stage. Parameter is response from dependencyOrder.

[
    [
        {
            "packageName": "<package-a>",
            "stage": 0,
            "dependencies": [],
            "devDependencies": [],
            "packageMeta": {
                "directory": "/path/to/package-a",
                "name": "<package-a>",
                "packageJson": { "name": "<package-a>", "version": "1.2.3" }
            }
        },
    ],
    [
        {
            "packageName": "<package-b>",
            "stage": 1,
            "dependencies": ["<package-a>"],
            "devDependencies": [],
            "packageMeta": {
                "directory": "/path/to/package-b",
                "name": "<package-b>",
                "packageJson": { "name": "<package-b>", "version": "1.2.3" }
            }
        },
    ]
]